Use correct config_helper in Vanilla 2.6
Use correct config_helper in Vanilla 2.6

It's strange to use config_helper from Vanilla 2.4.1 plugin in
Vanilla 2.6.0 plugin. This patch repair this issue.

Change-Id: I1b4892544911361abcdcd23f774e4cf8e04c52d2
Closes-bug: 1448021

zhangjunli177/sahara,openstack/sahara,esikachev/sahara-backup,esikachev/sahara-backup,ekasitk/sahara,henaras/sahara,crobby/sahara,ekasitk/sahara,openstack/sahara,crobby/sahara,tellesnobrega/sahara,esikachev/sahara-backup,tellesnobrega/sahara,ekasitk/sahara,zhangjunli177/sahara,egafford/sahara,henaras/sahara,henaras/sahara,crobby/sahara,egafford/sahara,zhangjunli177/sahara